Fifteen-year-old Aya Fuse, an Extra, just wants to lay low, so when she discovers the secret lives of the Sly Girls, she wants to report their story, but she knows that would propel her into a celebrity status she's not prepared for.

Just before their sixteenth birthdays, when they will will be transformed into beauties whose only job is to have a great time, Tally's best friend runs away and Tally must find her and turn her in, or never become pretty at all.